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Regulatory matters - Regulatory Assets and Liabilities (Detail) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Mar. 01, 2020 MWac
Regulatory Liabilities [Line Items] |  |  |
Total regulatory assets | $ 1,167,625 | $ 846,519 |
Less: current regulatory assets | (158,212) | (64,090) |
Non-current regulatory assets | 1,009,413 | 782,429 |
Total regulatory liabilities | 576,189 | 601,518 |
Less: current regulatory liabilities | (65,809) | (38,483) |
Non-current regulatory liabilities | $ 510,380 | 563,035 |
Capital expenditure shortfall refundable to customers (percent) | 80.00% |  |
Income taxes |  |  |
Regulatory Liabilities [Line Items] |  |  |
Total regulatory liabilities | $ 295,720 | 322,317 |
Cost of removal |  |  |
Regulatory Liabilities [Line Items] |  |  |
Total regulatory liabilities | 191,981 | 200,739 |
Pension and Postremployment benefits |  |  |
Regulatory Liabilities [Line Items] |  |  |
Total regulatory liabilities | 34,468 | 26,311 |
Fuel and commodity cost adjustments |  |  |
Regulatory Liabilities [Line Items] |  |  |
Total regulatory liabilities | 18,229 | 20,136 |
Clean energy and other customer programs |  |  |
Regulatory Liabilities [Line Items] |  |  |
Total regulatory liabilities | 14,829 | 10,440 |
Rate adjustment mechanism |  |  |
Regulatory Liabilities [Line Items] |  |  |
Total regulatory liabilities | 3,316 | 5,214 |
Other |  |  |
Regulatory Liabilities [Line Items] |  |  |
Total regulatory liabilities | 17,646 | 16,361 |
Fuel and commodity cost adjustments |  |  |
Regulatory Liabilities [Line Items] |  |  |
Total regulatory assets | 339,900 | 18,094 |
Retired generating plant |  |  |
Regulatory Liabilities [Line Items] |  |  |
Total regulatory assets | 185,073 | 194,192 |
Coal generation capacity (MW) | MWac |  |  | 200
Pension and Postremployment benefits |  |  |
Regulatory Liabilities [Line Items] |  |  |
Total regulatory assets | $ 134,141 | 178,403 |
Future service years of employees | 10 years |  |
Rate adjustment mechanism |  |  |
Regulatory Liabilities [Line Items] |  |  |
Total regulatory assets | $ 117,309 | 99,853 |
Retroactive rate adjustment collection period | 24 months |  |
Regulatory asset, amortization period | 26 years |  |
Environmental remediation |  |  |
Regulatory Liabilities [Line Items] |  |  |
Total regulatory assets | $ 81,802 | 87,308 |
Environmental remediation, rate recovery period | 7 years |  |
Income taxes |  |  |
Regulatory Liabilities [Line Items] |  |  |
Total regulatory assets | $ 79,472 | 77,730 |
Deferred capitalized costs |  |  |
Regulatory Liabilities [Line Items] |  |  |
Total regulatory assets | $ 62,599 | 34,398 |
Regulatory asset, amortization period | 20 years |  |
Capitalized operating and maintenance costs, recovery rate, (percent) | 2.43% |  |
Capitalized operating and maintenance costs, recovery period | 29 years |  |
Wildfire mitigation and vegetation management |  |  |
Regulatory Liabilities [Line Items] |  |  |
Total regulatory assets | $ 35,789 | 22,736 |
Debt premium |  |  |
Regulatory Liabilities [Line Items] |  |  |
Total regulatory assets | 34,204 | 35,688 |
Asset retirement obligation |  |  |
Regulatory Liabilities [Line Items] |  |  |
Total regulatory assets | 26,810 | 26,546 |
Clean energy and other customer programs |  |  |
Regulatory Liabilities [Line Items] |  |  |
Total regulatory assets | 26,015 | 26,400 |
Rate review costs |  |  |
Regulatory Liabilities [Line Items] |  |  |
Total regulatory assets | 9,167 | 8,054 |
Long-term maintenance contract |  |  |
Regulatory Liabilities [Line Items] |  |  |
Total regulatory assets | 9,134 | 14,405 |
Other |  |  |
Regulatory Liabilities [Line Items] |  |  |
Total regulatory assets | $ 26,210 | $ 22,712 |

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- Definition Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are expected to be recovered through revenue sources within one year or the normal operating cycle, if longer. Such costs are capitalized if they meet both of the following criteria: a. It is probable that future revenue in an amount at least equal to the capitalized cost will result from inclusion of that cost in allowable costs for rate-making purposes. b. Based on available evidence, the future revenue will be provided to permit recovery of the previously incurred cost rather than to provide for expected levels of similar future costs. If the revenue will be provided through an automatic rate-adjustment clause, this criterion requires that the regulator's intent clearly be to permit recovery of the previously incurred cost. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
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